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From:	"Ozkan Sezer (sezeroz AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Date:	Thu, 16 Feb 2023 15:25:34 +0300
Message-ID:	<CAA2C=vA8tH7vJ24kaNk3x8txvROon_K8UEdMJh_9b78utm1SAw@mail.gmail.com>
Subject:	Re: dxe: page fault when derefencing an exported pointer variable
To:	djgpp AT delorie DOT com
Cc:	Daniel Borca <dborca AT yahoo DOT com>
Reply-To:	djgpp AT delorie DOT com
Errors-To:	nobody AT delorie DOT com
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>> The 'normal' vars don't seem to have a problem, but dereferencing
>> that particular pointer results in a page fault:

Well, I was very very wrong:

I added some debug printf() statements to a simple program, so that
it prints the values of certain variables exported by the library :

UBYTE md_volume      : 233 (0xe9) --- should have been 128
UBYTE md_musicvolume : 233 (0xe9) --- should have been 128
UBYTE md_sndfxvolume : 233 (0xe9) --- should have been 128
UBYTE md_reverb      : 233 (0xe9) --- should have been 0
UBYTE md_pansep      : 233 (0xe9) --- should have been 128
UWORD md_mixfreq     : 44100
UWORD md_mode        : 63977 (0xf9e9) --- should have been 0x110F
UWORD md_device      : 9705  (0x25e9) --- should have been ???
MDRIVER* md_driver   : 0xcea27e9
CHAR* md_driver->Name: [crash...]

Note that all of those values have 0xe9 - except for md_mixfreq to
which I do assign 44100.  0xe9 (i.e.: jmp) seems to be coming from
dlstatbind():
https://www.delorie.com/bin/cvsweb.cgi/djgpp/src/libc/dxe/dxe3stat.c?rev=1.1

Looks like exported variables support in import libraries is very
much broken?

- Raw text -